adds __hash__ method to Factor class
adds __hash__ method to Factor class

ankurankan/pgmpy,pratyakshs/pgmpy,palashahuja/pgmpy,yashu-seth/pgmpy,kris-singh/pgmpy,ankurankan/pgmpy,palashahuja/pgmpy,jhonatanoliveira/pgmpy,yashu-seth/pgmpy,sandeepkrjha/pgmpy,kislayabhi/pgmpy,khalibartan/pgmpy,abinashpanda/pgmpy,liquidmetal/pgmpy,vivek425ster/pgmpy,abinashpanda/pgmpy,liquidmetal/pgmpy,pgmpy/pgmpy,vivek425ster/pgmpy,kris-singh/pgmpy,anaviltripathi/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,kislayabhi/pgmpy,jhonatanoliveira/pgmpy,pratyakshs/pgmpy,anaviltripathi/pgmpy,pgmpy/pgmpy